Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932129AbbBYCRu (ORCPT ); Tue, 24 Feb 2015 21:17:50 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:43660 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753691AbbBYCRR (ORCPT ); Tue, 24 Feb 2015 21:17:17 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Austin Lund , Mauro Carvalho Chehab Subject: [PATCH 3.18 20/20] [media] media/rc: Send sync space information on the lirc device Date: Tue, 24 Feb 2015 18:10:35 -0800 Message-Id: <20150225020854.932637798@linuxfoundation.org> X-Mailer: git-send-email 2.3.0 In-Reply-To: <20150225020854.096477776@linuxfoundation.org> References: <20150225020854.096477776@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2045 Lines: 54 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Austin Lund commit a8f29e89f2b54fbf2c52be341f149bc195b63a8b upstream. Userspace expects to see a long space before the first pulse is sent on the lirc device. Currently, if a long time has passed and a new packet is started, the lirc codec just returns and doesn't send anything. This makes lircd ignore many perfectly valid signals unless they are sent in quick sucession. When a reset event is delivered, we cannot know anything about the duration of the space. But it should be safe to assume it has been a long time and we just set the duration to maximum. Signed-off-by: Austin Lund Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/rc/ir-lirc-codec.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) --- a/drivers/media/rc/ir-lirc-codec.c +++ b/drivers/media/rc/ir-lirc-codec.c @@ -42,11 +42,17 @@ static int ir_lirc_decode(struct rc_dev return -EINVAL; /* Packet start */ - if (ev.reset) - return 0; + if (ev.reset) { + /* Userspace expects a long space event before the start of + * the signal to use as a sync. This may be done with repeat + * packets and normal samples. But if a reset has been sent + * then we assume that a long time has passed, so we send a + * space with the maximum time value. */ + sample = LIRC_SPACE(LIRC_VALUE_MASK); + IR_dprintk(2, "delivering reset sync space to lirc_dev\n"); /* Carrier reports */ - if (ev.carrier_report) { + } else if (ev.carrier_report) { sample = LIRC_FREQUENCY(ev.carrier); IR_dprintk(2, "carrier report (freq: %d)\n", sample); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/